煤基石墨烯宏观体的制备及其在CO<sub>2</sub>光催化还原过程中的应用

煤基石墨烯宏观体的制备及其在CO₂光催化还原过程中的应用

摘要: 石墨烯是一种新型二维碳质材料,以石墨烯为基本结构单元构筑宏观石墨烯材料是石墨烯走向实际应用的重要途径。以煤基石墨为原料,综合采用Hummers法、化学还原及冷冻干燥过程制备出煤基石墨烯宏观体。利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、傅里叶红外光谱(FT-IR)、拉曼光谱等对样品形貌结构进行了分析表征。此外,以煤基石墨烯宏观体为光催化剂填料搭建固定床反应器,应用于CO₂光催化还原过程。结果表明,煤基石墨烯宏观体对CO₂光催化还原反应具有较高的催化活性,目标产物甲醇的产率最高可达65.91 μmol/g·cat。

Abstract: A 3D graphene assembly was prepared by chemical reduction using coal-based graphene oxide as the raw material. The morphologies and structures of the samples were analyzed by SEM, TEM, FT-IR and Raman spectroscopy. Results show that the 3D graphene has a high catalytic activity for photocatalytic CO₂ reduction in a fixed bed reactor and the yield of the target product, methanol, is up to 65.91 mol/g of catalyst.